Gamma-ray Burst 110319A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 19 Mar 11 02:16:58 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     449578,   Seg_Num: 0
  GRB_RA:          356.401d {+23h 45m 36s} (J2000),
                   356.553d {+23h 46m 13s} (current),
                   355.717d {+23h 42m 52s} (1950)
  GRB_DEC:         -66.017d {-66d 01' 01"} (J2000),
                   -65.955d {-65d 57' 16"} (current),
                   -66.295d {-66d 17' 40"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       4261 [cnts]    Image_Peak=187 [image_cnts]
  TRIGGER_DUR:     1.024 [sec] 
  TRIGGER_INDEX:   146     E_range: 25-100 keV
  BKG_INTEN:       27328 [cnts]
  BKG_TIME:        8185.23 SOD {02:16:25.23} UT
  BKG_DUR:         8 [sec]
  GRB_DATE:        15639 TJD;    78 DOY;   11/03/19
  GRB_TIME:        8201.61 SOD {02:16:41.61} UT
  GRB_PHI:         -122.46 [deg]
  GRB_THETA:         9.16 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     12.16 [sigma]
  IMAGE_SIGNIF:    7.06 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +0  +2  -3  +0  +0 -41  +0 
  SUN_POSTN:       358.28d {+23h 53m 08s}   -0.74d {-00d 44' 35"}
  SUN_DIST:         65.22 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
  MOON_POSTN:      167.83d {+11h 11m 19s}   -0.10d {-00d 05' 46"}
  MOON_DIST:       113.65 [deg]
  MOON_ILLUM:      99 [%]
  GAL_COORDS:      313.20,-49.78 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      316.36,-55.91 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Coordinates.  
  COMMENTS:        This is a rate trigger.  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the on-board catalog.  
  COMMENTS:        This does not match any source in the ground catalog.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        This trigger occurred at longitude,latitude = 221.56,-16.28 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 19 Mar 11 02:18:08 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     449578,   Seg_Num: 0
  GRB_RA:          356.4996d {+23h 46m 00.09s} (J2000),
                   356.6516d {+23h 46m 36.38s} (current),
                   355.8169d {+23h 43m 16.05s} (1950)
  GRB_DEC:         -66.0123d {-66d 00' 44.2"} (J2000),
                   -65.9500d {-65d 56' 59.9"} (current),
                   -66.2901d {-66d 17' 24.2"} (1950)
  GRB_ERROR:       5.5 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       1.10e-09 [erg/cm2/sec]
  GRB_SIGNIF:      7.28 [sigma]
  IMG_START_DATE:  15639 TJD;    78 DOY;   11/03/19
  IMG_START_TIME:  8257.48 SOD {02:17:37.48} UT,   55.9 [sec] since BAT Trigger Time
  TAM[0-3]:        327.64 237.23 261.61 243.23
  AMPLIFIER:       2
  WAVEFORM:        134
  SUN_POSTN:       358.29d {+23h 53m 09s}   -0.74d {-00d 44' 33"}
  SUN_DIST:         65.22 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
  MOON_POSTN:      167.84d {+11h 11m 21s}   -0.10d {-00d 06' 04"}
  MOON_DIST:       113.65 [deg]
  MOON_ILLUM:      99 [%]
  GAL_COORDS:      313.15,-49.80 [deg] galactic lon,lat of the burst
  ECL_COORDS:      316.42,-55.93 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        The XRT position is 2.42 arcmin from the BAT position.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 19 Mar 11 02:18:19 UT
  NOTICE_TYPE:     Swift-XRT Image
  TRIGGER_NUM:     449578,   Seg_Num: 0
  GRB_RA:          356.4996d {+23h 46m 00.0s} (J2000),
                   356.6516d {+23h 46m 36.3s} (current),
                   355.8169d {+23h 43m 16.0s} (1950)
  GRB_DEC:         -66.0123d {-66d 00' 44.2"} (J2000),
                   -65.9500d {-65d 56' 59.9"} (current),
                   -66.2901d {-66d 17' 24.2"} (1950)
  GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       53 [cnts]
  IMG_START_DATE:  15639 TJD;    78 DOY;   11/03/19
  IMG_START_TIME:  8257.48 SOD {02:17:37.48} UT,   55.9 [sec] since BAT Trigger Time
  CENTROID_X:      281.43,  raw= 281  [pixels]
  CENTROID_Y:      235.14,  raw= 235  [pixels]
  ROLL:            2.06 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -148.17
  GRB_POS_XRT_Z:   -49.18
  IMAGE_URL:       sw00449578000msxps_rw.img
  SUN_POSTN:       358.29d {+23h 53m 09s}   -0.74d {-00d 44' 33"}
  SUN_DIST:         65.22 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
  MOON_POSTN:      167.84d {+11h 11m 22s}   -0.10d {-00d 06' 07"}
  MOON_DIST:       113.65 [deg]
  MOON_ILLUM:      99 [%]
  GAL_COORDS:      313.15,-49.80 [deg] galactic lon,lat of the burst
  ECL_COORDS:      316.42,-55.93 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 19 Mar 11 02:20:10 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     449578,   Seg_Num: 0
  GRB_RA:          356.401d {+23h 45m 36s} (J2000),
                   356.553d {+23h 46m 13s} (current),
                   355.717d {+23h 42m 52s} (1950)
  GRB_DEC:         -66.017d {-66d 01' 01"} (J2000),
                   -65.955d {-65d 57' 16"} (current),
                   -66.295d {-66d 17' 40"} (1950)
  GRB_DATE:        15639 TJD;    78 DOY;   11/03/19
  GRB_TIME:        8201.61 SOD {02:16:41.61} UT
  TRIGGER_INDEX:   146
  GRB_PHI:         -122.46 [deg]
  GRB_THETA:         9.16 [deg]
  DELTA_TIME:      -37.00 [sec]
  TRIGGER_DUR:     1.024 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     12.16 [sigma]
  IMAGE_SIGNIF:    7.06 [sigma]
  LC_URL:          sw00449578000msb.lc
  SUN_POSTN:       358.29d {+23h 53m 09s}   -0.74d {-00d 44' 31"}
  SUN_DIST:         65.22 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
  MOON_POSTN:      167.86d {+11h 11m 26s}   -0.11d {-00d 06' 35"}
  MOON_DIST:       113.64 [deg]
  MOON_ILLUM:      99 [%]
  GAL_COORDS:      313.20,-49.78 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      316.36,-55.91 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Lightcurve.  
  COMMENTS:           
  COMMENTS:        The next comments were copied from the BAT_POS Notice:  
  COMMENTS:        This is a rate trigger.  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the on-board catalog.  
  COMMENTS:        This does not match any source in the ground catalog.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        This trigger occurred at longitude,latitude = 221.56,-16.28 [deg].  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 19 Mar 11 02:20:48 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     449578,   Seg_Num: 0
  POINT_RA:        356.397d {+23h 45m 35s} (J2000)
  POINT_DEC:       -66.024d {-66d 01' 26"} (J2000)
  POINT_ROLL:      2.056d
  IMG_START_DATE:  15639 TJD;    78 DOY;   11/03/19
  IMG_START_TIME:  8267.14 SOD {02:17:47.14} UT,   65.5 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        3.598
  N_STARS:         30
  X_OFFSET:        536 [pixels]
  Y_OFFSET:        528 [pixels]
  X_MAX:           1495 [pixels]
  Y_MAX:           1487 [pixels]
  DET_THRESH:      16
  PHOTO_THRESH:    9
  SL_URL:          sw00449578000msufc0065.fits
  SUN_POSTN:       358.29d {+23h 53m 09s}   -0.74d {-00d 44' 31"}
  SUN_DIST:         65.23 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
  MOON_POSTN:      167.87d {+11h 11m 28s}   -0.11d {-00d 06' 45"}
  MOON_DIST:       113.63 [deg]
  MOON_ILLUM:      99 [%]
  GAL_COORDS:      313.20,-49.77 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      316.35,-55.91 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 19 Mar 11 02:22:02 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     449578,   Seg_Num: 0
  POINT_RA:        356.397d {+23h 45m 35s} (J2000)
  POINT_DEC:       -66.024d {-66d 01' 26"} (J2000)
  ROLL:            2.056d
  IMG_START_DATE:  15639 TJD;    78 DOY;   11/03/19
  IMG_START_TIME:  8267.14 SOD {02:17:47.14} UT,   65.5 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     322193873
  X_OFFSET:        1031 [pixels]
  Y_OFFSET:        1075 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1191
  Y_GRB_POS:       1235
  BINNING_INDEX:   1
  IM_URL:          sw00449578000msuni0072.fits
  SUN_POSTN:       358.29d {+23h 53m 09s}   -0.74d {-00d 44' 30"}
  SUN_DIST:         65.23 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
  MOON_POSTN:      167.88d {+11h 11m 31s}   -0.12d {-00d 07' 04"}
  MOON_DIST:       113.63 [deg]
  MOON_ILLUM:      99 [%]
  GAL_COORDS:      313.20,-49.77 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      316.35,-55.91 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Image.  
  COMMENTS:        The GRB Position came from the XRT Position Command.  
  COMMENTS:        The image has 2x2 binning (compression).  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 19 Mar 11 02:27:21 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     449578,   Seg_Num: 0
  POINT_RA:        356.400d {+23h 45m 36s} (J2000)
  POINT_DEC:       -66.026d {-66d 01' 34"} (J2000)
  POINT_ROLL:      2.052d
  IMG_START_DATE:  15639 TJD;    78 DOY;   11/03/19
  IMG_START_TIME:  8479.10 SOD {02:21:19.10} UT,   277.5 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        0.285
  N_STARS:         16
  X_OFFSET:        711 [pixels]
  Y_OFFSET:        755 [pixels]
  X_MAX:           1670 [pixels]
  Y_MAX:           1714 [pixels]
  DET_THRESH:      5
  PHOTO_THRESH:    2
  SL_URL:          sw00449578000msufc0277.fits
  SUN_POSTN:       358.29d {+23h 53m 10s}   -0.74d {-00d 44' 24"}
  SUN_DIST:         65.24 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
  MOON_POSTN:      167.93d {+11h 11m 43s}   -0.14d {-00d 08' 25"}
  MOON_DIST:       113.61 [deg]
  MOON_ILLUM:      99 [%]
  GAL_COORDS:      313.20,-49.77 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      316.35,-55.91 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 19 Mar 11 02:28:00 UT
  NOTICE_TYPE:     Swift-XRT Position UPDATE
  TRIGGER_NUM:     449578,   Seg_Num: 0
  GRB_RA:          356.5020d {+23h 46m 00.48s} (J2000),
                   356.6540d {+23h 46m 36.95s} (current),
                   355.8193d {+23h 43m 16.64s} (1950)
  GRB_DEC:         -66.0110d {-66d 00' 39.5"} (J2000),
                   -65.9487d {-65d 56' 55.3"} (current),
                   -66.2888d {-66d 17' 19.6"} (1950)
  GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       1.00e-10 [erg/cm2/sec]
  GRB_SIGNIF:      10.00 [sigma]
  IMG_START_DATE:  15639 TJD;    78 DOY;   11/03/19
  IMG_START_TIME:  8313.00 SOD {02:18:33.00} UT,   111.4 [sec] since BAT Trigger Time
  TAM[0-3]:        100.00 100.00 100.00 100.00
  AMPLIFIER:       1
  WAVEFORM:        31
  SUN_POSTN:       358.29d {+23h 53m 10s}   -0.74d {-00d 44' 24"}
  SUN_DIST:         65.22 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
  MOON_POSTN:      167.93d {+11h 11m 44s}   -0.14d {-00d 08' 35"}
  MOON_DIST:       113.61 [deg]
  MOON_ILLUM:      99 [%]
  GAL_COORDS:      313.15,-49.80 [deg] galactic lon,lat of the burst
  ECL_COORDS:      316.42,-55.93 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
  COMMENTS:        TAM values, flux and significance fields are not valid.  
  COMMENTS:        This position was automatically generated on the ground using  
  COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
  COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
  COMMENTS:        This position was enhanced using UVOT field astrometry.  
  COMMENTS:        The probability that this is a serendipitous source in the  
  COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 19 Mar 11 02:28:47 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     449578,   Seg_Num: 0
  POINT_RA:        356.400d {+23h 45m 36s} (J2000)
  POINT_DEC:       -66.026d {-66d 01' 34"} (J2000)
  ROLL:            2.052d
  IMG_START_DATE:  15639 TJD;    78 DOY;   11/03/19
  IMG_START_TIME:  8479.10 SOD {02:21:19.10} UT,   277.5 [sec] since BAT Trigger Time
  FILTER:          7, U
  EXPOSURE_ID:     322194085
  X_OFFSET:        1031 [pixels]
  Y_OFFSET:        1075 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1191
  Y_GRB_POS:       1235
  BINNING_INDEX:   1
  IM_URL:          sw00449578000msuni0284.fits
  SUN_POSTN:       358.29d {+23h 53m 10s}   -0.74d {-00d 44' 23"}
  SUN_DIST:         65.24 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
  MOON_POSTN:      167.94d {+11h 11m 46s}   -0.15d {-00d 08' 47"}
  MOON_DIST:       113.60 [deg]
  MOON_ILLUM:      99 [%]
  GAL_COORDS:      313.20,-49.77 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      316.35,-55.91 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Image.  
  COMMENTS:        The GRB Position came from the XRT Position Command.  
  COMMENTS:        The image has 2x2 binning (compression).  
  

  
• GCN Circular #11807
  A. Melandri (INAF-OAB), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), P. D'Avanzo (INAF-OAB), J. M. Gelbord (PSU), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), N. P. M. Kuin (UCL-MSSL), R. Margutti (INAF-OAB), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/IASFPA) and M. H. Siegel (PSU) report on behalf of the Swift Team:
  At 02:16:41 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110319A (trigger=449578). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 356.401, -66.017 which is

     RA(J2000) = 23h 45m 36s
     Dec(J2000) = -66d 01' 01"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about ~30 sec. The peak count rate was ~3800 counts/sec (15-350 keV), at ~5 sec after the trigger.
  The XRT began observing the field at 02:17:37.5 UT, 55.9 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 356.5017, -66.0114 which is equivalent to:

     RA(J2000)  = 23h 46m 0.40s
     Dec(J2000) = -66d 00' 40.9"
  

  with an uncertainty of 2.3 arcseconds (radius, 90% containment). This location is 148 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
  A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.62 x 10^20 cm^-2 (Kalberla et al. 2005).
  The initial flux in the 2.5 s image was 1.10e-09 erg cm^-2 s^-1 (0.2-10 keV).
  UVOT took a finding chart exposure of 150 seconds with the White filter starting 66 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7' x 2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.03.
  Burst Advocate for this burst is A. Melandri (andrea.melandri AT brera.inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
• GCN Circular #11808
  M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
  Using 285 s of XRT Photon Counting mode data and 1 UVOT images for GRB 110319A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 356.50181, -66.01113 which is equivalent to:

  RA (J2000): 23h 46m 0.43s
  Dec (J2000): -66d 00' 40.1"
  

  with an uncertainty of 1.8 arcsec (radius, 90% confidence).
  This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
  This circular was automatically generated, and is an official product of the Swift-XRT team.
• GCN Circular #11810
  A. Melandri, B. Sbarufatti and R. Margutti (INAF-OAB) reports on behalf of the Swift-XRT team:
  We have analysed 9.9 ks of XRT data for GRB 110319A (Melandri et al. GCN Circ. 11807), from 47 s to 23.4 ks after the BAT trigger. The data comprise 33 s in Windowed Timing (WT) mode (the first 7 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN. Circ 11808).
  The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=3.7 (+0.6, -0.3). At T+151 s the decay flattens to an alpha of -0.63 (+0.07, -0.65). The light curve breaks again at T+4335 s to a decay with alpha=0.98(+0.11, -0.10).
  A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 3.4 (+0.4, -0.3). The best-fitting absorption column is 2.4 (+0.7, -0.6) x 10^21 cm^-2, in excess of the Galactic value of 2.6 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.33 (+0.13, -0.14) and a best-fitting absorption column of 1.16 (+0.32, -0.18) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.3 x 10^-11 (5.0 x 10^-11) erg cm^-2 count^-1.
  A summary of the PC-mode spectrum is thus:

  Total column:	     1.16 (+0.32, -0.18) x 10^21 cm^-2
  Galactic foreground: 2.6 x 10^20 cm^-2
  Excess significance: 10.8 sigma
  Photon index:	     2.33 (+0.13, -0.14)
  

  The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00449578.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #11811
  S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), A. Melandri (INAF-OAB), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
  Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 110319A (trigger #449578) (Melandri, et al., GCN Circ. 11807). The BAT ground-calculated position is RA, Dec = 356.510, -66.008 deg, which is

     RA(J2000)  =  23h 46m 02.4s 
     Dec(J2000) = -66d 00' 28.7" 
  

  with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
  The mask-weighted light curve shows two overlapping peaks starting at ~T_zero, peaking at ~T+5 and ~T+13 sec, and ending at ~T+30 sec. T90 (15-350 keV) is 19.3 +- 1.6 sec (estimated error including systematics).
  The time-averaged spectrum from T-0.3 to T+31.3 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.31 +- 0.43, and Epeak of 21.9 +- 7.0 keV (chi squared 54.2 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.4 +- 0.1 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+13.10 sec in the 15-150 keV band is 2.2 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.55 +- 0.08 (chi squared 86.5 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
  The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/449578/BA/
• GCN Circular #11812
  M. H. Siegel (PSU), S. T. Holland (CRESST/USRA/GSFC) and A. Melandri (INAF-OAB) report on behalf of the Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of GRB 110319A 65s after the BAT trigger (Melandri et al, GCN Circ 11807). We identify an optical afterglow near the enchanced XRT position given by Melandri et al. (GCN Circ. 11810). The transient is only detected in the optical filters and shows fading between the first and second orbits.
  The preliminary UVOT position is:

       RA (J2000)  23:46:00.69  =  356.50287 (deg)
      Dec (J2000) -66:00:40.4   =  -66.01122 (deg)
  

  with an estimated uncertainty of 0.44 arcsec (radius, 90% confidence, statistical + systematic). Preliminary 3-sigma upper limits and magnitudes using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the exposures are:

  Filter    T_start(s) T_stop(s)  Exp(s)   Mag
  white (fc)      65      215    147     18.36+-0.07
  white         3924     5560    393     20.32+-0.22
  v             4336     5971    393    >19.56
  b             3719     5355    393     19.51+-0.21
  b            11317    11950    615    >20.63
  u              277      395    115     18.13+-0.13
  u             4950    11310   1081     19.76+-0.18
  uvw1          4745     4945    196    >19.72
  uvw1          9497    10397    885    >20.58
  uvm2          4540     4740    196    >19.64
  uvm2          5976     6172    193    >19.69
  uvw2          4131     4330    196    >19.91
  uvw2          5566     5766    196    >19.91
  

  The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
• GCN Report 328.1
  GCN_Report 328.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_328_1.pdf by A. Melandri at INAF-OAB titled: "Final Report on Swift GRB 110319A"